Jason,
The alumilite vs PR is a good question, but I don't have a good answer.
Just to confuse the issue, the PR Dawn is using now is more dense than Castin Craft. So, it should be stronger. So, not all PR is created equal.
The above are not hard facts, they are MY OBSERVATIONS in turning all of the materials.
Unfortunately, I fear you will have to conduct your own testing to find an answer. Those of us who have a "vested interest" in one product or the other are unlikely to be objective, no matter how hard we may try!!
Lousy answer, but the only honest one I have.